Anti-Bullying campaign. The link above describes phsiycal bullying, but you can adapt this for your class to entail cyber bullying. The children have to create flyers and public brochures to make people aware of cyber bullying and ways to prevent it.
The Learning Federation. (2012). Anti-bullying campaign.
Retreived from http://econtent.thelearningfederation.edu.au/ec/viewing/L940/index.html on 8/4/12.
Education Services Australia Ltd.